Figure 4.

Algorithmic approach for assessment of lymph node with features of CD. Patients with lymph nodes with histologic features suggestive of CD should be evaluated for sites of involvement. If lymph node involvement is restricted to one site, the lesion most likely represents unicentric CD. If multiple sites are involved, patients should be evaluated for HHV-8, POEMS, and other infectious, malignant, and autoimmune disorders listed in Table 2 Exclusion Criteria. If these conditions are excluded, a diagnosis of iMCD should be considered. There are 3 major histopathologic subtypes of iMCD: hypervascular (formerly hyaline-vascular), mixed, and plasmacytic pathology. *iMCD patients with TAFRO syndrome frequently demonstrate hypervascular or mixed pathology.